Dear manonegra222, I have followed your instructions carefully except no 1 "1. Remove the SD card from the reader for a few weeks. Use the tablet during this time without a card and starting on both systems normally." because I cannot wait for a "few weeks" more as my 1 year warranty will expire soon, and as I said to my previous post I don't see the point of "waiting for a few weeks" in a deterministic device like a tablet ! Whatever happens in a few hours will also happen in a few weeks. The computers do not "mature" with time !
So I did the following:
1. I removed the SD card from the reader for a few HOURS. I used the tablet during this time without a card and starting on both systems normally.
2. While this time passed, I prepared the SD card by making a primary partition in FAT32 format for Android of 31 Gb and the rest of the card in a primary partition in NTFS format.
3. When time indicated in point 1 passed, I started the tablet in Windows having connected a USB stick (no matter what the content of the USB stick). I connected one via a OTG cable (micro USB male to USB type A female).
4. Once the operating system had been booted, I entered the SD card I had prepared.
Result: The micro SD was recognized but when I tried to perform a file copy to it, it instantly disappeared !
So these instructions DO NOT SOLVE THE PROBLEM with the micro SD reader.
I repeated the instructions many times. One of the times, the micro SD was recognized as not formatted,and Windows suggested to format it. I formatted it in full capacity (64 GB) NTFS. After the micro SD even accepted file operations (file copy, rename, etc). But when I restarted windows it again ..... disappeared !
So the well known stochastic behavior of the micro SD slot repeats itself.
It is true, though, that the concurrent existence of a USB stick, makes the micro SD slot to recognize micro SD cards more easily, but the erratic behavior continues.
So I again conclude that it has to be either a hardware problem or a BIOS problem.
My Chuwi Hi10 plus was bought in November 2016 and it HAS the micro SD problem, but it was working well at the start.
I have also bought 2 Chuwi Hi12 in April 2017. None of them has any problem with the micro SD card. So maybe Chuwi discovered that some component (namely the micro SD reader) was erratic and maybe it later replaced it in the production line. Thus, some tablets seem to have the problem and some others don't.
But in any case, whether it is a BIOS problem or a component problem Chuwi has to REPAIR THE MALFUNCTIONING TABLETS WITHIN THE WARRANTY PERIOD, and at no cost for the customer.
But instead of that we get reports that Chuwi has 0 after sales service. I myself have sent dozens of mails to firstname.lastname@example.org with no response.
Even Chuwi's agents say that :
"This is Chuwi support. Equals a big "0". This is all just a big sprinkling powder, a scam that European customers buy from them. That's my opinion. All my clients have the same thing. They do not respond to customers for months...."
If Chuwi wants to clear its name it HAS to conform to its obligations and offer its customers REAL AFTER SALES CUSTOMER SUPPORT especially for malfunctioning products.
Otherwise we talk about a fraud !
Am I right ?